remote: fix leak in reachability check of a remote-tracking ref

In `check_if_includes_upstream()` we retrieve the local ref
corresponding to a remote-tracking ref we want to check reachability
for. We never free that local ref and thus cause a memory leak. Fix
this.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

remote.c

@@ -2731,6 +2731,7 @@ static void check_if_includes_upstream(struct ref *remote)
 
 	if (is_reachable_in_reflog(local->name, remote) <= 0)
 		remote->unreachable = 1;
+	free_one_ref(local);
 }
 
 static void apply_cas(struct push_cas_option *cas,

t/t5533-push-cas.sh

@@ -5,6 +5,7 @@ test_description='compare & swap push force/delete safety'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 setup_srcdst_basic () {